The Croatian Ministry of Foreign and European Affairs on Wednesday strongly protested with the charge d'affaires at the Slovenian Embassy in Croatia after Slovenian authorities, which have been putting a barbed wire fence alone the country's border with Croatia to control the migrant influx, put the fence on a part of Croatian territory.

"Slovenia has been requested to remove the fence in the shortest time possible," the ministry said in a statement

Official Slovenian sources too describe the area in question as belonging to the Republic of Croatia, the ministry said.

The Croatian police earlier in the day warned that the fence the Slovenian police were putting along the border with Croatia to control the migrant influx near the border crossing of Harmica was on Croatia's territory and that it would have to be removed from there.

The part of the fence encroaching on Croatia's territory is in the area of responsibility of the Zagreb Police Precinct and Zagreb police chief Goran Burusic this afternoon informed the Slovenian police of Croatia's position.

After the negotiations between Burusic and Slovenian officials, Croatia withdrew riot police from the area after having reportedly sent them there to remove the fence. According to media reports, the situation at the border was tense throughout the day as Slovenia also deployed some 50 riot police along its part of the border.

A State Secretary at the Slovenian Ministry of the Interior, Bostjan Sefic, said that Croatia had been informed of Slovenia's plan to put a fence on parts of its border and that the fence was on Slovenia's side of the border and not on Croatia's as claimed by Croatian authorities.

The barriers are being put exclusively on Slovenian territory and they do not prejudge the borderline, the Slovenian government's public relations office said in a statement.

Beirut (dpa) - Syrian government forces and their allies advanced deeper into the shrinking rebel-held enclave in eastern Aleppo on Wednesday, seizing the Old City, while demanding the armed opposition groups leave the area.